diff options
| author | Nicolas Pitre <nico@cam.org> | 2005-06-29 00:27:45 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-28 21:38:47 -0700 |
| commit | 69a2d426f0d249bca2c6f754b3c1283c0fa72fd4 (patch) | |
| tree | b71e760d5a5da66dda5170b9c2ad6073c10f9814 /count-delta.c | |
| parent | 9d5ab9625ddb53a68a99516225d0bcb39ec473d5 (diff) | |
| download | git-69a2d426f0d249bca2c6f754b3c1283c0fa72fd4.tar.gz | |
[PATCH] denser delta header encoding
Since the delta data format is not tied to any actual git object
anymore, now is the time to add a small improvement to the delta data
header as it is been done for packed object header. This patch allows
for reducing the delta header of about 2 bytes and makes for simpler
code.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'count-delta.c')
| -rw-r--r-- | count-delta.c | 21 |
1 files changed, 9 insertions, 12 deletions
diff --git a/count-delta.c b/count-delta.c index c7f3767880..8901034188 100644 --- a/count-delta.c +++ b/count-delta.c @@ -11,16 +11,13 @@ static unsigned long get_hdr_size(const unsigned char **datap) { const unsigned char *data = *datap; - unsigned long size; - unsigned char cmd; - int i; - size = i = 0; - cmd = *data++; - while (cmd) { - if (cmd & 1) - size |= *data++ << i; - i += 8; - cmd >>= 1; + unsigned char cmd = *data++; + unsigned long size = cmd & ~0x80; + int i = 7; + while (cmd & 0x80) { + cmd = *data++; + size |= (cmd & ~0x80) << i; + i += 7; } *datap = data; return size; @@ -47,8 +44,8 @@ int count_delta(void *delta_buf, unsigned long delta_size, unsigned char cmd; unsigned long src_size, dst_size, out; - /* the smallest delta size possible is 6 bytes */ - if (delta_size < 6) + /* the smallest delta size possible is 4 bytes */ + if (delta_size < 4) return -1; data = delta_buf; |